Hydraulic press.



NOQ 777,975. v I PATENTED DEC. 20, 1904. 0. PHILIPP.

HYDRAULIC PRESS.

APPLICATION FILED APB. 19.1904.

N0 MODEL.

UNITED STATES Patented December 20, 1904.

PATENT OFFICE.

OTTO PHILIPP, OF DRESDEN, GERMANY, ASSIGNOR TO ELEKTROGRAVIIRE,

GESELLSOHAFT MIT BESCHRANKTER HAFTUNG, OF LIEPSIO-SELLER- HAUSEN, GERMANY.

HYDRAULIC PRESS.

SPECIFICATION forming part of Letters Patent No. 777,975, dated December 20, 1904.

I Application filed April 19,1904. Serial No. 203,846.

To (07/7, whom, it may concern.-

Be it known that I, O'rro PHILIPP, a citizen of Germany, residing at Dresden, Germany, have invented new and useful Improvements in Hydraulic Presses, of which the following is a specification.

This invention relates to a hydraulic press operated by a pressure-spindle and of the class in which the transmission of power from the spindle to the piston takes place after the platen has ceased to run light.

By the present invention the pressure-spindle is separated from the piston, which is frequently desirable for constructive reasons.

In the accompanying drawings, Figure 1 is an elevation, partly in section, of my im proved hydraulic press; and Fig. 2 is a similar view of a modification.

The pressure-cylinder 1 is secured to the base 2 and is either integral therewith or formed of a separate piece rigidly connected thereto. The fixed platen 3 is arranged above the base and is supported by posts 4. The

cylinder 1 is engaged by the pressure-piston 7, to which is secured the movable platen 8. The working cylinder 5 for the pressure-spin- .dle 6 is arranged at right angles to the line of pressure. A first lever 9 is adapted to transmit the motion from the pressure-spindle 6 to the pressure-piston 7 during its return stroke. The lever 9 is elbow-shaped and is fulcrumed at 10 to an arm 31 of platen 3. The horizontal arm of lever 9 is by a link 11 connected to the movable platen 8, and consequently to the piston 7, while the vertical arm of lever 9 is adapted to contact at time with a collar 12 of spindle 6.

The cylinders 1 and 5 are connected with each other by a duct 13, so that the liquid may freely flow from one cylinder into the other. The water is admitted froma suitable reservoir or source of water supply (not shown) by a pipe 26. This pipe is controlled by a valve 15, normally closed by spring 14. The stem 19 of valve 15 is pivoted to the lower end of a lever 18, fulcrumed at its upper end 21 to a fixed support 32. To the lever 18 is pivoted one end of a link 17, the other end of which is pivoted to the upper end of a second lever 16, fulcrumed at 20 to the upright arm of elbow-lever 9. The link 17 is arranged at the same elevation as fulcrum 10 of lever 9, and. its length is such that normally the lower end of lever 16 is slightly in advance of lower end of lever 9, as indicated in the drawings.

The platen 8 is engaged by a lever 23, fulcrumed at 22 and carrying a counterweight 24, which tends to raise the platen, together with the piston 7.

The operation is as follows: In its extreme outward position the spindle 6 by collar 12 and elbow-lever 9 holds the piston 7 in its lowermost position. In this position the lower end of lever 16 is turned to the right by 001- lar 12 and the valve 15 is opened. Upon advancing spindle 6 the collar 12 will be moved to the left and permit the lever 9 to be turned. Thus the weight 24 will be free to raise the platen 8 and piston 7 as long as the machine runs light or, in other words, until the workpiece 25, resting on platen 8, contacts with platen 3. During this movement the lower ends of levers 9 and 16 will remain in contact with and follow collar 12. The valve 15 will meanwhile remain open against action of spring 14, so that water may continue to enter cylinder 1 through pipe 26. As soon as the work-piece 25 contacts with the platen 3 the piston 7, with its platen 8, can no longer follow the movement of the spindle. The latter, therefore, advances independently and the collar 12 will move away from lever 9. The lever 16, however, will follow the collar 12 by the action of spring 14 until the valve 15 is closed. The further advance of spindle 6 will now move the collar 12 away from both levers 9 and 16, the parts being then in the position shown in the drawings. During this movement the water will be dis placed from cylinder 5 and forced into cylinder 1 through duct 13, so that the piston 7 is forced upward in a ratio depending upon the relative cross-sections of piston 7 and spindle 6. IVhile this action takes place the lever 9 will be tilted; but its movement will not in- 17 opposite fulcrum 10. Upon the return movement of the spindle 6 the latter will first run free until its collar 12 swings lever 16, and thereby opens valve 15. The further return movement of the spindle will now turn elbow-lever 9 so that piston 7 and platen 8 will be forced into their lowermost position, simultaneously raising counterweight 24. During this time the water will escape from cylinder 1 through pipe 26.

The spindle 6 may be operated in suitable manner, as by a crank-shaft, screw, rack, or steam-piston, &c.

In Fig. 2 the arrangement issubstantially the same as that shown in Fig.1; but the spindle 6 and cylinder 5 are arranged parallel to piston 7. With this construction the lever 9 is straight and the lever 16 is connected by link 17 to stem 19 of valve 15, the lever 18 being omitted. The fixed platen 3 is shown to be arranged at the bottom of the press and the piston 7 performs its work on the clownstroke, so that it will descend by gravity during the light running of the press. The counterweight 24: is therefore dispensed with. The spindle 6 is shown to be made in the form of a piston-rod, the piston 27 of which reciprocates within a steam-cylinder 28.

What I claim is 1. In a hydraulic press, the combination of a pressure-cylinder having a valve with a working cylinder communicating with the pressurecylinder, a piston in the pressure-cylinder, a spindle in the working cylinder, a first lever that operatively connects the spindle with the piston, a second lever pivoted to said first lever, and means for operatively connecting the second lever With the valve, substantially as specified.

2. In a hydraulic press, the combination of a pressure-cylinder having a valve with a Working cylinder communicating with the pressurecylinder, a piston in the pressure-cylinder, a spindle in the working cylinder, a collar on the spindle, a first lever operatively connected to the piston, a second lever pivoted to the first lever, and means for operatively connecting the second lever to the valve, the first and second levers being adapted to engage the spindle-collar, substantially as specified.

Signed by me at Dresden, Germany, this 31st day of March, 1904.

OTTO PHILIPP. Witnesses:

RUDOLPH FRICKE, P. V. T. DUNN. 

